#include <iostream>
#include <vector>
#include <cstddef>
int main()
{
using std::cin;
using std::cout;
using std::endl;
using std::size_t;
std::vector<double> miles(4);
std::vector<double> gallons(4);
for (size_t i = 0; i <= 4; ++i) // off-by-one error (OBOE)
{
cout << "Miles: ";
cin >> miles.at(i);
cout << "\nGallons: ";
cin >> gallons.at(i);
cout << endl;
}
}
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